Week 4

Question 1

Definition and types of extraction based on phase

Answer 1

Unit operation serve to separate the component in material which involve two phase
Solid and liquid (leaching), solid and gas (supercritical fluid extraction)

Question 2

System of extraction

Answer 2

Mechanical pre-treatment
Thermal pre-treatment

Question 3

Types of extraction based on mode operation

Answer 3

Batch operation (single stage)
Continuous extraction concurrent
Continuous extraction counter current

Question 4

Types of extractor in industry scale

Answer 4

Batch percolators
Fixed bed multistage (semi continuous)
Continuous percolators

Question 5

What is supercritical fluid extraction

Answer 5

To extract non/polar components using high pressure carbon dioxide

Question 6

Application of supercritical fluid extraction

Answer 6

To extract caffeine from coffee
To remove cholesterol from fat/oil

Question 7

Advantages of supercritical fluid extraction

Answer 7

CO2 is non-toxic solvent
Non-flammable
Low-cost
High quality product yield

Question 8

Phases of supercritical fluid

Answer 8

Two phases coexist -> subcritical -> supercritical